I am looking for Yaoi/Yuri manga's where all but the main couple are straight. (Siblings, friends etc)
Ex Boyfriends/Grilfriends and/or One night stands can be gay.

I am also looking for manga's where someone gay comes out to their (straight) family. This does not have to be Yaoi/Yuri as long as it has a gay character.

(By gay I mean LGBT.)

I am sick and tired of manga's where everybody is gay.. Come on, at the end of the day there will always be a overwhelming majority of straight people. Let's see some reality for once.

Edited for clarification.

Koiha Ina Mono Mouna Mono - Faaar from realistic, but the only gay guys are the main couple and there's a fairly realistic coming-out in the last chapter.

Otona no Mondai Okay it's more like the story about a gay couple as perceived from the eyes of a bystander and yes, everyone else is straight.

There are probably far more titles but i haven't read much manga in such a long time.

But seriously... only Yaoi and yuri manga? I think you might be setting up your demands to be too high.

Okay some more... but old ones:

Mirai no Kioku and Future Lovers II

Yume Musubi, Koi Musubi

I don't know if Border really counts? 😕

http://www.mangaupdates.com/showtopic.php?tid=14098&page=1#post344857
this thread might help you ^^